Codes P0303 & P0304 - Misfire in cylinders 3 & 4
P1000 - OBD2 (OBDII) Scan Test is Incomplete
The computer system or ECM, PCM (engine control module, powertrain control module) that controls your car is equipped with a basic operating program. This operating program is designed to control your engine, transmission, emissions, safety systems and more. If a scan has been performed by using a code scanner and a "scan could not be completed" code is retrieved further troubleshooting is necessary. Usually a trouble code P1000 or manufacturers equivalent. We have listed several reasons for this condition.
Stuck Engine Thermostat - If the engine thermostat has stuck open it forces the engine coolant to stay at too low of a temperature causing the ECM/PCM to stay in open loop. This open loop creates a state of preprogrammed parameters were no diagnostic tests can be preformed. (ECM/PCM is constantly waiting for the engine to heat up to operating temperature for closed loop operation)
Shorted Oxygen Sensor/Coolant Sensor - The ECM/PCM relies on information from sensors to operated, if one of these sensors is severely shorted it can cause the ECM/PCM to stay in open loop, causing a code gathering incomplete trouble code
Shorted Fuel Injector - If a fuel injector short circuits it can cause the engine not to run by shorting the injector driver. If the car doesn't run and a code gathering incomplete trouble code like P1000 is present, it could be a fuel injector shorted. Unplug all injectors and try to rescan system
Wednesday, December 30th, 2009 AT 10:27 AM